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Collision induced ion ejection in an FTICR trapped-ion cell.

C Richard Arkin¹, D A Laude

¹Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712, USA.

Journal of the American Society for Mass Spectrometry

|March 1, 2005

Summary

Collision-mediated ion ejection in ICR MS was studied. Three energy regimes dictate ion loss, influencing FTICR signal damping and cooling techniques.

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Area of Science:

Analytical Chemistry
Physical Chemistry

Background:

Ion ejection mechanisms are crucial for understanding trapped-ion cell dynamics in Ion Cyclotron Resonance Mass Spectrometry (ICR MS).
Collision-mediated processes significantly influence ion behavior and signal integrity within these cells.

Purpose of the Study:

To investigate and characterize collision-mediated ion ejection mechanisms in ICR MS experiments.
To define the energy regimes and collision parameters governing ion loss from trapped-ion cells.

Main Methods:

Utilized a collision algorithm with SimIon software for simulation.
Analyzed ion ejection based on kinetic energy, ion mass, trapping potential, and collision gas mass.

Main Results:

Identified three distinct collision-based energy regimes for ion loss.
Regime 1: Low kinetic energy, radial ejection, high collision ratio (>100).
Regime 2: Medium-high kinetic energy, axial ejection, low collision ratio (1-10).
Regime 3: High kinetic energy, radial ejection, unity collision ratio.
Established a radial ejection limit at ~40% cell radius, causing ejection after one collision.

Conclusions:

The identified energy regimes and ejection limits have significant implications for Fourier Transform ICR (FTICR) signal damping.
Findings impact the development and optimization of ion cooling and activation techniques.
Understanding these mechanisms is vital for improving remeasurement experiments in ICR MS.

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